准噶尔盆地西南缘白垩系烃源岩地球化学特征

Subject:Geochemical characteristics of cretaceous source rocks in Junggar Basin

通过对准噶尔盆地西南缘露头剖面和探井数据进行系统采样,运用有机地球化学分析方法,从有机质丰度、有机质类型和有机质成熟度三个方面对白垩系烃源岩进行系统的分析。结合准噶尔盆地西南缘的区域地质特征,对该区白垩系烃源岩进行综合评价。结果显示,准噶尔盆地西南缘白垩系烃源岩有机质丰度不高,但非均质性强,大部分地区发育较差的烃源岩,部分地区发育好的烃源岩。烃源岩有机质类型主要为II2型和III型,不同层段烃源岩样品的Ro分布在0.52~0.87,平均值为0.73,处于低熟至成熟演化阶段。

The paper is mainly writing by the research of the outcrop profile and probe profile of junggar basin.Based on the organic geochemistry analysis method,a systematic analysis of the cretaceous source rocks was carried out from three aspects:organic matter abundance,organic matter type and organic matter maturity.Based on the regional geological characteristics of the southwest margin of junggar basin,the cretaceous source rocks were evaluated comprehensively.The results show that the organic matter abundance of cretaceous source rocks is not high,but the organic matter heterogeneity is obvious.The hydrocarbon source rocks are poorly developed in most areas and well developed in some areas.The organic matter types of cretaceous source rocks are mainly II2 and III.The Ro distribution of source rock samples from different strata is 0.52~0.87,with an average value of 0.73,which is in the stage of low maturity to mature evolution.